What is the average life span of a mosquito?

The average life cycle of a mosquitoes depends upon the species if the mosquito. Culex tarsalis may complete its life cycle in 14 days at 20 °C (68 °F) and only ten days at 25 °C (77 °F). Some species have a life cycle of as little as four days, whereas in other species some adult females can live through the winter, laying their eggs in the spring. Many species of mosquito live their adult stage in roughly two weeks to two months.
Source(s):
http://en.wikipedia.org/wiki/Mosquito